mcp-server-kubernetes/dist/utils/sse.js

MCP server for interacting with Kubernetes clusters via kubectl

import express from "express";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
export function startSSEServer(server) {
    const app = express();
    // Currently just copying from docs & allowing for multiple transport connections: https://modelcontextprotocol.io/docs/concepts/transports#server-sent-events-sse
    // TODO: If exposed to web, then this will enable any client to connect to the server via http - so marked as UNSAFE until mcp has a proper auth solution.
    let transports = [];
    app.get("/sse", async (req, res) => {
        const transport = new SSEServerTransport("/messages", res);
        transports.push(transport);
        await server.connect(transport);
    });
    app.post("/messages", (req, res) => {
        const transport = transports.find((t) => t.sessionId === req.query.sessionId);
        if (transport) {
            transport.handlePostMessage(req, res);
        }
        else {
            res
                .status(404)
                .send("Not found. Must pass valid sessionId as query param.");
        }
    });
    let port = 3000;
    try {
        port = parseInt(process.env.PORT || "3000", 10);
    }
    catch (e) {
        console.error("Invalid PORT environment variable, using default port 3000.");
    }
    const host = process.env.HOST || "localhost";
    app.listen(port, host, () => {
        console.log(`mcp-kubernetes-server is listening on port ${port}\nUse the following url to connect to the server:\n\http://${host}:${port}/sse`);
    });
}